Dosage calculator



FIG. 1 is a top plan view of a dosage calculator, shown in a closed position;

FIG. 2 is a top view thereof, shown in a fully opened position;

FIG. 3 is a top perspective view thereof, shown in a half-opened position; and,

FIG. 4 is a bottom perspective view thereof, shown in a half-opened position.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for a dosage calculator, as shown and described. 